Blower-unloading device.



J. G. MAGLAREN.

BLOWER UNLOADING DEVIGIL.

APPLICATION FILED JAN. 6, 1908.

961,364, Patented June 14,1910

2 SHEETS-SHEET 1.

ANDREW B GRAHAM co. PNOTO-LITHOGRAVNERS. WASHINGTON. u. C.

a: G. MAGLAREN. BLOWER UNLOADING DEVICE.

APPLICATION FILED (NLRB, 1908. 9&1 36% Patented June 14, 1910.

2 SHEETS-SHIBET 2.

. UNITED STATES PATENT caries.

JAMES G. MACLAREN, 0F WEEHAWKEN, NEW JERSEY, ASSIGNOR TO LAMSON CON-SOLIDATED STORE SERVICE COMPANY, OF NEWARK, NEW JERSEY, A CORPORATION OFNEW JERSEY.

To all whom it may concern:

Be it known that I, JAMES G. MACLAREN, of Weehawken, in the county ofHudson and State of New Jersey, have invented certain new and usefulImprovements in Blower-Unloading Devices, of which the following is aspecification.

My invention relates to improvements in blower unloading devices and isparticularly adapted for use in connection with pneumatic despatch tubesystems. The object of this invention is to intermittently load andunload the blower, that is, to allow the blower to run normally free,and when it is desired to load the same the blower is automaticallythrown into communication with the load.

In connection with despatch tube systems when it is desired to despatchcarriers the blower is thrown into communication with the transmissiontubes and when the carriers have delivered the blower is automaticallythrown out of communication with the system and allowed to run free.

Numerous other features of my invention are herein described andparticularly pointed out in the claims.

In the accompanying drawings is illustrated a construction embodying myinvention in which Figure l is a diagrammatic view, partly in section,of the device in connection with a pneumatic despatch tube system. Fig.2 is an enlarged sectional elevation of the device showing the mechanismin normal position with blower unloaded. Fig. 3 is a similar view toFig. 2 and showing the position of the mechanism with the blower loaded.

Like characters of reference refer to like parts throughout the severalviews.

Referring to Fig. l, C represents a tube for the transmission ofcarriers connecting the station A with the ordinary discharge terminal Dcontrolled by the usual valve D at the station B.

E is a transmission tube for the return of carriers and connects theterminal D with the terminal F controlled by the usual valve F atstation A.

G is a tube connecting the terminal F with the conduit or air supplypipe H which is connected at one end with the cylinder 1 and at theother end with the vacuum connection of a blower P.

M is an electric motor adapted to drive Specification of Letters Patent.Application filed January 6, 1908.

. Patented June 14, 1910. Serial No. 409,398.

the blower P through a belt M stant speed.

S is a solenoid magnet having an armature S pivoted to lever L at L saidlever L being stationarily pivoted at one end at L, the opposite ormovable end having a slot L 2 is a pin fixed to the lower end of apiston rod 2 and mounted in the slot L and 3 and 4 are pistons mountedin the cylinder 1 and secured to the upper end of rod 2. Ports 7 incylinder 1 are adapted to normally supply air to chamber 5 and conduitH. i

8 is a by-pass connecting the conduit H with the chamber 6 in lower partof cylinder 1 beneath piston 4 and is controlled by an adjustable timingvalve 9. 13 and 16 are ports in said by-pass 8 and are controlledrespectively by valves 12 and 15 mounted on the arm 10 pivoted at oneend at 11. A spring 14 is adapted to normally hold valves 12 and 16 awayfrom ports 13 and 16.

The normally open switches a and b are located at stations A and Brespectively and are adapted to energize the magnet S. The circuitcontrolled by switch a is as follows, from battery X through wire a,switch a, wire a magnet S, and back to battery X through wire a Switch Bis in multiple with circuit of switch a through wires 6 and 6 Theoperation of the device is as follows z-To despatch a carrier fromstation A to station E, with the parts in normal position and the blowermoving at a constant speed and taking air through ports 7 and conduit H(see Figs. 1 and 2), the operator closes the switch a and inserts thecarrier into the bellmouth C. The closing of switch a energizes thesolenoid magnet S attracting and moving the armature S upward and movinglever L together with the piston rod 2 and pistons 3 and 4, therebycutting off the flow of air through ports 7 and conduit H to blower P(see Fig. 3). The air now entering the bellmouth C and flowing throughtubes C, E and G to conduit H and blower P drives the carrier throughtube C toward station E. The upward movement of the pistons 3 and 4 isunrestricted owing to the admission of air through port 16 and by-pass 8to chamber 6. The operator now releases the switch or button a breakingthe circuit and deenergizing the magnet S and releasing armature S.

at a con- The vacuum in the conduit H and by-pass 8 above timing valve 9is now sufficient to actuate valve 12 and lever 10 against the action ofspring lt causing the valves 12 and 15 to close ports 13 and 16respectively. The admission of air through ports 13 and 16 being cutoit, the vacuum acts through by-pass 8 to gradually exhaust the air fromchamber 6 allowing the pistons 3 and 1 to drop by gravity until by thetime the carrier has delivered at station E the valve 3 has uncoveredports 7 (see Figs. 1 and 3) short circuiting the flow of air andunloading the blower P. The vacuum in the bypass 8 now being destroyedthe valves 12 and 15 are opened by the tension of spring 14;. The timingvalve 9 may be adjusted to time the drop of pistons 3 and 1, (andconsequent short circuit-ing of the air current) to the proper intervalnecessary for the transmission and delivery of the carrier.

In despatching a carrier from station B to station A the operatorinserts the carrier into the inlet E and closes the switch 5 energizingthe magnet S, the air currents being established in a manner identicalwith that heretofore described and the carrier delivering at station A.

Having thus described my invention and set forth a constructionembodying the same, what I claim as new and desire to secure by LettersPatent of the United States, is

1. In an apparatus of the character herein described, a constantlyoperating pressure producing member normally communicating with theatmosphere, a receptacle or conduit, means for switching said memberinto communication with said receptacle or conduit, and means forautomatically switching said member from communication with said conduitto the atmosphere.

2. In an apparatus of the character herein described, a constantlyoperating pressure producing member normally communicating with theatmosphere, a receptacle or conduit, means for switching said memberinto communication with said receptacle or conduit, means forautomatically switching said member from communication with said conduitto the atmosphere, and means for timing the communication of said memberwith said receptacle or conduit.

3. In a pneumatic despatch tube apparatus, a constantly operating bloweror pump normally communicating with the atmosphere, a tube for thetransmission of carriers, and means for switching said blower or pumpinto communication with said transmission tube to establish a current ofair through said tube for the transmission of carriers.

4. In a pneumatic despatch tube apparatus, a tube for the transmissionof carriers, a constantly operating blower or pump, means normallyconnecting said blower with the atmosphere, means for throwing saidblower into communication with said transmission tube to establishacurrent of air through said tube for the transmission of carriers, andmeans for automatically throwing said blower into communication with theatmosphere.

5. In a pneumatic despatch tube apparatus, a constantly operating bloweror pump normally communicating with the atmosphere, a tube for thetransmission of carriers, a conduit or connection between said blower orpump and said transmission tubeprovided with an air inlet, meansnormally permitting the admission of air through said inlet and conduitto said blower, and means for closing said inlet and for switching saidblower into communication with said transmission tube to establish acurrent of air through said tube for driving carriers there through.

6. In a pneumatic despatch tube apparatus, a tube for the transmissionof carriers, a blower or pump, a conduit or connection between saidblower or pump and said transmission tube provided with an air inlet,means normally. permitting the admission of air through said inlet andconduit to said blower, means for closing said inlet to establish acurrent of air through said transmission tube for driving carrierstherethrough, and means for automatically opening said air inlet andshort circuiting the current of air to the atmosphere.

7. In a pneumatic despatch tube apparatus, a tube for the transmissionof carriers, a blower or pump, a conduit or connection between saidblower or pump and said transmission tube provided with an air inlet,means normally permitting the admission of air through said inlet andconduit to said blower, means for closing said inlet to establish acurrent of air through said transmission tube for driving carriers therethrough, means normally urging the opening of said inlet, and means fortiming the opening of said inlet and the short circuiting of said aircurrent.

In testimony whereof, I have signed my name to this specification in thepresence of two subscribing witnesses, this thirty-first day of DecemberA. D. 1907.

JAMES Gr. MAGLAREN.

WVitnesses WM. HEPPERLE, ELSIE MAQLAREN.

